12g295 unleaded conversion
Turbo Mini Forums

Going to get a 295 head reconditioned but didn't know if I should do an unleaded conversion as well at the same time.

Is it right that 295 heads are known to crack after having an unleaded conversion done? Don't Want to end up with a big bill and a cracked head at the end of it!!

Also its going to be turbo powered as well could that add more strain on the head making cracking more likely?

Thanks

Because the inserts are an interference fit there's always a chance of the head cracking, more so on the prehistoric 295 heads.

Phil.

WWW.TURBO-MINI.COM

Would you recommend leaving the head leaded and just use an additive instead?

It doesn't help if they are put in with too much interference so get someone who knows what they are doing.. I dont think theres much more chance of the 295 head cracking than the 940 head tho is there? Is the material that different??

I wouldnt hesitate to do it to my head. Done plenty before with no problems.

It will most likely be fine, but it is something to be aware of. I think it's the age of the head and the many heat cycles they've been through that can increase the chances slightly. 99% of the time there's no issue.

Phil.

WWW.TURBO-MINI.COM

Would running an additive cause any boost problems if I decide not to convert?.

I don't bother with additive in my standard 998 head but with this being a 295 head I thought I would look after it better...

Thanks

I think you'll need to do many many thousands of miles before you'll need to do anything about valve seat recession. Just chuck some additive in once every now and then, not sure if premium unleaded helps these days or not with it, always run anything i care about on vpower or bp ultimate if i can't get to a shell garage anyway.

On a 295 turbo, I'd fit seats to reduce the likelihood of cracking.